Williams begins service on deepwater Gulf of Mexico gathering pipeline system

July 24, 2019

Offshore staff

TULSA – Williams reports that it has acquired and placed into service the 16-in. Norphlet deepwater gathering pipeline system constructed by Shell Offshore Inc. and CNOOC Petroleum Offshore U.S.A. Inc. (CNOOC).

The pipeline extends 54 miles from the Shell-operated Appomattox platform in 7,400 ft of water to the Transco Main Pass 261A junction platform, located approximately 60 mi south of Mobile, Alabama. First gas deliveries took place on June 22, 2019.

The acquisition extends the reach of the Williams pipeline network by connecting Williams’ existing Transco offshore pipeline lateral to the prolific Jurassic play developed by Shell and CNOOC in the eastern Gulf of Mexico.

The Norphlet deepwater gas gathering pipeline system, which is capable of gathering an estimated 261 to 291 MMcf/d of natural gas, connects more than 33,000 acres of dedicated leases to Williams’ Mobile Bay processing facility via the Transco lateral at the Main Pass 261A junction platform.

The completed project also included the installation of a spare subsea connector for additional floating production system volumes, as well as modifications to Williams’ Mobile Bay processing facility, including a 118% expansion to the slug handling capacity and a 329% increase in stabilizing capacity.

Williams says that the Norphlet deepwater gas gathering system is well positioned for future growth with approximately 50% of the pipeline’s contractual capacity remaining available for future producer discoveries in the area.